1. var a, b :real;
begin readln(a, b); writeln(sqrt(a*a + b*b)); end.
2. var s1, s2, a1, a2 :real;
begin readln(s1, s2);
if s1 / 3.14159265 < s2 / 4 then writeln('yes') else writeln('no');
end.
3. var x, y :real;
begin readln(x);
if x < -10 then y:=234 - x*x*x else y:=x * x + 54;
writeln(y);
end.